Heres a link to a list of tools on the Symantec website

http://www.symantec.com/home_homeoff...movaltools.jsp

and a link specifically to the Blaster worm

http://www.symantec.com/home_homeoff...081119-5051-99



If you can, run the link to the Symantec Online Scanner -- it will at least give you a name, then go back to the first link in this post, and hopefully there is a tool that can fix it for you.